Steam-generator.



PATENTED MAY 26, 1903.

m. 72,402.-- J. H. PEELEN.

STEAM GENERATOR. v APPLIOATIOF PILED JAN. 2, 1903.

10 your UNITED STATES Patented May 26, 1903.

PATENT OFFICE.

JAN I-IENDRIK PEELEN, OF OBERLAHNSTEIN,'GERMANY.

STEAM-G EN ERATOR.

SPECIFICATION forming part of Letters Patent No. 729,402, dated May 26, 1903.

Application filed January 2, 1903. Serial No. 137,451. (No model.)

To all whom it may concern.-

I Be it known that I, JAN HENDRIK PEELEN, engineer,a citizen of Prussia,residing at Oberlahnstein, in the Empire of Germany, have invented certain new and useful Improvements in Steam-Generators, of which the following is a specification.

This invention relates to fire tubes for steam-generators, which tubes differ from those hitherto employed, owing to the fact that they are not of cylindrical but of ear or crescent shape and are arranged in pairs in place of a tube of the known cylindrical form.

The invention is illustrated in the accompanying drawings, in which-- Figures 1 and 2 show a pair of these novel fire-tubes replacing a single cylindrical firetube and somewhat eccentrically arranged in the boiler in the usual manner, Fig. 1 being a horizontal longitudinal section on the line so 00 of Fig. 2, and Fig. 2 a vertical cross-section on theliney y of Fig. 1 through the generator, all known parts immaterial to this invention being omitted. Fig. 3 is a vertical cross-section through a pair of the ear-shaped fire-tubes, and Fig. l is a section on the line 2 z of Fig. 3.

The fire-tubes aandbare arranged in pairs, usually in place of one cylindrical fire-tube of the known kind, with the inner curves of their crescent formation directed one toward the other, as shown in Figs. 2 and 3. Between the two tubes 0. and b there exists an interval, which is of course narrowest where the upper and lower extremities approach each other at c and widest at the middle. This intermediate space is therefore in direct communication with the water-space of the steam -generator, so that the water in the lower portion is able to pass upward through this interval.

In order to maintain the tubes a and b as nearly as possible at an exact interval one from the other, I arrange between each two lengths, Figs. 1 and 4:, a stiffening-plate cl, Fig. 3, having the same outer diameter d as the outer edges of theflanges of the tubes at and I) together. This plate presents in addition to the two openings of the same cross-sec tion as those in the crescent-shaped fire-tubes an inner aperture of the same diameter d as the edges of the flanges on the tubes a and b,

directed one toward the other. The water therefore has a free passage through all the assemblages of tubes in the direction of their length, and it is also able to pass between the tubes from below upward, as shown in Fig. 2.

At the fore extremity of the tubes at and b, I

next the grate, is provided a similar plate f, Figs. 1 and 4,which,however, is not furnished with a central aperture, so that the novel water-space is closed at this point. The rear extremity of this Water-space is prolonged at 'i to the rear masonry h of the boiler. In the back of this prolongation t is arranged a manhole having a cover 7c, by which access may be obtained to the water-space between the tubes 0/. and b. In front of the fore extremity of this water-space may advantageously be placed a plate g of refractory material, over which the combustion-gases pass, as indicated by arrows in Fig. 1.

This novel form of fire-tube presents the following advantages as compared with the cylindrical form hitherto employed: increase of heating-surface, augmentation of waterspace, improvement of the water circulation,

more speedy generation of steam without theproduction of supersaturated steam,obviation of deposits of ashes'in the fire-'tubes, because owing to the increased velocity of the draft these ashes are carried away, and better transmission of heat, because the hot gases come into more intimate contact with the walls of the fire-tubes,while with cylindrical fire-tubes a great part of the heat is only transmitted by radiation.

What I claim, and desireto secure by Letters Patent of the United States, is

1. In a steam-generator, a pair of crescentshaped fire-tubes provided with flanges, and a stiffener-plate secured between said flanges and having openings of the same cross-seetion as those in the fire-tubes.

2. In a steam-generator, a pair of crescentshaped fire-tubes provided with flanges, a stiffener-plate secured between said flanges and having openings of the same cross-section as those in the fire-tubes, and an inner aperture of the same diameter as the space between the flanges of said tubes.

3. In a steam-generator, a plurality of pairs of crescent-shaped fire-tubes,similarly-shaped stiffening-plates having central apertu res,and

a closure for the inner end of the central aperture between said tubes.

4. In asteam-generator, a plurality of pairs ofcrescent-shaped firc-tubes,similarly-shaped stilfening-plates having central apertures, a closure for the inner end of the central aperture between said tubes, and a plate of refractory material adjacent to said closure.

In testimony whereof I have hereunto set my hand, in presence of two subscribing witto nesses, this 17th day of December, 1902.

JAN HENDRIK PEELEN.

Witnesses:

CARL SCHMIDT, W. FREIHERR VON LYNEKER. 

